#p  'grid.dat' w l lt 7
p '-' w p ps 3 pt 5 t 'source', '-' w p ps 3 pt 5 t 'images' , 'cc.dat' w l t 'critica', 'cc.dat' u 3:4 w l t 'caustica'
0.0  0.000000e+00 
e
7.756372e-20 -6.362636e-01 -4.546169e+00  7.068700e-02
-5.547361e-23  6.362636e-01 -4.546169e+00  7.068700e-02
-7.776778e-01 -5.732329e-22  5.556270e+00  0.000000e+00
7.776778e-01 -5.732232e-22  5.556270e+00  0.000000e+00
e
